Info box not correctly restored when onscreen keyboard is sliding down again

I am using iMockups 1.3, and the info box does not get properly resized when the keyboard gets hidden. To reproduce this problem:

1. Add an input box to the canvas
2. Tap the input box, and select info
3. Tap the Text: input box to enter the text, the onscreen keyboard appears, and the info box gets smaller so it gets not hidden behind the keyboard
4. Click the button on the onscreen keyboard to make it disappear
5. The info box does not get resized to the proper size again, making it impossible to change for instance the color of the text.